Cam-operating mechanism for gill boxes



r C. c. HEDRICK. CAM OPERATING MECHANISM FOR GILL 'BOXES.

- APPLICATION FILED JUNE 9.1921:

Patented June 6, 192 2. 1

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unites stares Parent yjorricef CHARLES C. HEDRICK, or CAMBRIDGE, iitassacnnsnrrs;:n'ssrerroaresaw-Lowest snore, or rosron, MASSACHUSETTS, A ooaronarroivor massaciresnrrs.

CAM-OPERATING rancnfanrsia' roe GILL ones;

Specification of Letters IEatent. I Patent d "Jung 6;

Application filed June 9, 1921. Serial No. 475,226.

T0 (ZZZ whom-i1. may concern:

Be it known that I, Crmnrrns C. Hnoeron, a citizen of the United States, andv a resident of Cambridge, Massachusetts, have invented certain new and useful Improvements in 'Cam-Operating Mechanism for Gill Boxes,

of which the following is a specification.

This invention relates to gill boxes, and particularly to mechanism for operating the cams used in such boxes for transferring the fallers from the return screws to th operating screws, and its object is to provide a construction which shall be simpler and more readily removable and replaceable than devices now in use. The invention consists in the particular construction and arrangement of the mechanism for operating said cams.

A. method in common use heretofore has been to carry said cams on a unitary disc mounted on the return screw. In the operation of the machines, these cams are subjected to heavy strains and frequently have to be replaced or renewed; and with the constructions heretofore in use, it has been necessary, in order to remove the cam disc for replacement or repair, to disconnect the gill screw shaft upon which the same was mounted. from its bearings, which involves a considerable expenditure of time and labor and often necessitates the shutting down of the machinery for considerable periods of time. In accordance with this invention, the cams are mounted on two separate half discs, of like form, and means are provided for firmly uniting them after they are separately applied to the screw shaft. This mounting thus ma kcs it possible to remove and replace either or both of the cams without removing the shaft from its bearings. By this means a very considerable savingin time and expense of making repairs is gained, and often also a saving in the expense of the repair part itself, since it frequently happens that one only of the two cams needs to be replaced.

In the accompanying drawings, Fig. 1 is side elevation, partly in section on the line 1, 1, Fig. of a screw shaftfor a gill box constructed in accordance with this invention. Fig. 2 is an elevation showing the two half discs, before being applied to the shaft. Fig. 3 is a sectional view on line 3, 3 of Fig. 1 looking towards the right of Fig. 1.

The screw shaft 1 is formed square in cross-section, in the portion 2 between the two shoulders 11 and 12, to form seats for the two half discs The tvvohalffdiscsiii, 3

have projecting shoulders 9, 9 having inner surfaces 10, 1O shaped to seat on thes'quared portion 2 m the screw shaft l. The, discs are thus' prevented from rotation with .ref-

tions 5, 5 of the shoulders ,9, 9 of the half discs 3, 3, and is forced into locking position, and firmly held in position by means of lock nuts 6 and Tengaging threaded portions of the shoulders 9, 9.;

To remove the half discs 3, 3, the operator unscrews the two lock nuts 6 and 7, and slips off thetapered sleeve 4, to the left, in Fig. 1. 3

Either or both of the half discs may then be readily removed. It is thus made possible by the use of my invention to replace a broken cam very much more quickly and easily than with any device heretofore in use. o

TV hat I claim as new and desire to secure by Letters Patent is:

1. Cam operating mechanism for a gill box, consisting of a shaft, a plurality of camcarrying members seated on-said shaft, ta pered shoulders on said cam carrying mem bers, a tapered sleeve surrounding said shaft and adaptedto embrace said tapered shoul-. ders on said canrcarrying members to hold the same in position on said shaft.

2. Cam operating mechanism for a gill box, consisting of a shaft, a plurality of c-amcarrying members seated on said shaft, tapered shoulders on said cam carrying members, a tapered sleev surrounding said shaft and adapted to embrace said tapered shoulders on said cam-carrying members to hold the same in position on said shaft, and means for locking said sleeve in place. 1

3. Cam operating mechanism fora gill box, consisting of a shaft, a plurality ofcam carrying members, shoulders on said cam carrying members,fseats on said shaft adapted i to engage said shoulders on said cam-carrymg members to restrain said members from v 6 0 I erence to the shaft, and the shoulders 11 and I rotatory motion with respect to said shaft, and a sleeve surrounding said shaft and adapted to embrace said shoulders to hold the same in place on said seats,

4. Cam operating mechanism for a gill box consisting of a shaft, a plurality of carncarrying members, seats on said shaft for said cam-carrying members, and projections on said shaft to restrain said cam-carrying members from longitudinal motion'with re spect to said shaft.

5. Cam operating mechanismfora gill box consisting of a shaft, a plurality of camcarrying members, shoulders on said camcarrying members, seats on said shaft adapted to engage said shoulders on saidcam-carrying members to restrain said members from rotatory motion With respect to said shaft. means on said shaft to restrain said members from longitudinal motionwith reference to said shaft, and a sleeve surrounding said shaft and adapted to embrace said shoulders to hold the same in place on said seats.

In testimony whereof, I have hereunto set my hand in the presence of two subscribing Witnesses.

CHARLES C. HEDRICK. Witnesses:

HECTOR M. HoLMns, J. P. STILES. 

